Results 71 to 80 of about 1,156,553 (130)

Maximum principle for a nonlinear size-structured model of fish and fry management

Nonlinear Analysis, 2018
This paper investigates the maximum principle for a nonlinear size-structured model that describes the optimal management of the fish resources taking into account harvesting the fish and putting the fry.
Rong Liu, Guirong Liu
doaj   +1 more source

Existence of solutions for a second order problem on the half-line via Ekeland's variational principle [PDF]

, 2016
In this paper we study the existence of nontrivial solutions for a nonlinear boundary value problem posed on the half-line.
O’Regan, O’Regan, Bouafia, D., Moussaoui, T.   +2 more
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Concerning Kirk’s problem

Fixed Point Theory and Algorithms for Sciences and Engineering
This paper presents a straightforward statement for Khamsi’s theorem without assuming continuity or nondecreasing restrictions on η. Additionally, a new proof provides an affirmative answer to Kirk’s problem, supported by examples.
Hamid Mottaghi Golshan
doaj   +1 more source

Set order relations, set optimization, and Ekeland’s variational principle

This chapter provides a brief survey on different kinds of set order relations which are used to compare the objective values of set-valued maps and play a key role to study set optimization problems.
Ansari, Qamrul Hasan, Sharma, Pradeep Kumar   +1 more
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Cyclically monotone equilibrium problems and Ekeland’s principle

, 2017
We study the existence of equilibria and approximate equilibria avoiding any assumption of convexity both for the domain and for the bifunction. Our approach is based on the concept of cyclic monotonicity for bifunctions. First, we exploit this notion to
GIULI, MASSIMILIANO, Massimiliano Giuli
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Existence and multiplicity of weak solutions for a class of degenerate nonlinear elliptic equations

Boundary Value Problems, 2006
The goal of this paper is to study the existence and the multiplicity of non-trivial weak solutions for some degenerate nonlinear elliptic equations on the whole space RN. The solutions will be obtained in a subspace of the Sobolev space W1/p(RN).
Mihai Mihăilescu
doaj   +1 more source

Modern perspectives in Proof Theory. [PDF]

Philos Trans A Math Phys Eng Sci, 2023
Aguilera JP, Pakhomov F, Weiermann A.
europepmc   +1 more source

Variational Time Integrators in Computational Solid Mechanics [PDF]

, 2003
This thesis develops the theory and implementation of variational integrators for computational solid mechanics problems, and to some extent, for fluid mechanics problems as well.
Lew, Adrián José
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An order drop theorem

Le Matematiche, 2006
A drop theorem on ordered metric spaces is established from the (pre) order version of Ekeland’s variational principle in Turinici [An St UAIC Ia (Math), 36 (1990), 329-352]. The logical equivalence between these results is also discussed.
Mihai Turinici
doaj  

Variational inclusions problems with applications to Ekeland variational principle ,fixed point and optimization problems

, 2011
[[abstract]]In this paper, we prove the existence theorems of two types of systems of variational inclusions problem. From these existence results, we establish Ekeland’s variational principle on topological vector space, existence theorems of common ...
L. J. Lin
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